Please help! Tikz rendering error I can't find

[G00SE]

What I’m trying to do: Render a Venn diagram. It renders fine in Overleaf and looks like the image pasted below, but I must be making a noob mistake with TikZJax Obsidian. Could anyone help me figure out what I’m doing wrong please?

Things I have tried: I’ve tinkered, but I’m kinda new to this so I’m not sure where to start trying solutions! I have successfully rendered other codes (example at the bottom).

The code I’m trying to render:

\begin{tikzpicture}[scale=1.0]

% -- Node definitions (just positions here) --
\node (M) at (0,0) {};
\node (K) at (1.8,0) {};

% -- 1) Fill M entirely (light blue for example) --
\fill[blue!30] (M) circle (1.5cm);

% -- 2) Fill K entirely, overlapping everything including the intersection --
\fill[red!30] (K) circle (1.5cm);

% -- Finally, draw the outlines and labels for clarity --
\draw (M) circle(1.5cm) node[above left] {$M$};
\draw (K) circle(1.5cm) node[above right] {$K$};
\node at (0.9,0) {$B$};

\draw[dashed] (0.9,0) circle (3cm) 
    node[above, yshift=3 cm] {Soft Boundary}; % Adjust position with yshift

\end{tikzpicture}

The code that I’ve rendered successfully:

(This is a completely different image for a different topic, but it works fine so the Venn should be possible, there aren’t any other silly mistakes like forgetting to turn on TikZJaX haha.)

\begin{document}

\begin{tikzpicture}[line join = round, line cap = round]
\pgfmathsetmacro{\factor}{1/sqrt(2)};
\coordinate [label=right:C] (C) at (2,0,-2*\factor);
\coordinate [label=left:B] (B) at (-2,0,-2*\factor);
\coordinate [label=above:A] (A) at (0,2,2*\factor);
\coordinate [label=below:D] (D) at (0,-2,2*\factor);

\foreach \i in {A,B,C,D}
    \draw[dashed] (0,0)--(\i);
\draw[-, fill=red!30, opacity=1] (A)--(D)--(B)--cycle;
\draw[-, fill=blue!30, opacity=.5] (A) --(D)--(C)--cycle;
\draw[-, fill=purple!30, opacity=.5] (B)--(D)--(C)--cycle;
\end{tikzpicture}

\end{document}

Thank you!

~A

[holroy]

@G00SE

\node at (0.9,0) {$B$};

I don’t know tikz, but this looks a little suspicious. Which node is it referring to? Or what is B? If its the definition of B, then why don’t you use it anymore?

[G00SE]

Hello holroy! Thanks for the help This line places a ‘B’ in the overlapping area of the Venn diagram.

Just as an experiment I removed it and tried to re-render the code in Obsidian and it still doesn’t render. If I remove this in Overleaf, the B just disappears.

[holroy]

Adding \begin{document} and \end{document} around your code, I got this output:

So maybe just adding those was the:

@G00SE

… other silly mistakes like forgetting to turn on TikZJaX haha.)

[G00SE]

IT WORKED!

At first I nothing happened and I wrote a big reply. Then I found out the last problem by accident (because my preview on this website wouldn’t load properly either!):

This: \end{document}```
Needed to be this:

\end{document}
```

Thank you holroy!